Is Oxycodone Effective In Pain After Hip Replacement Surgery?

Well I m due shortly for hip replacement surgery. I am using oxycodone for the pain but to my distress the pharmacy switched my small pink 10 mg pills to some white ones that make me feel absolutely sick to my stomach. I m on the upper east side and no one has pink Zydus oxycodones. They work well with my body and don t make feel so very sick. Any suggestions please? Rosie YYYY@YYYY